test: set 20 minutes timeout for installation tests (#6363)

Author: dgozman

.github/workflows/tests.yml

@@ -107,6 +107,7 @@ jobs:
         - "^10.17.0" # pre 10.17, --unhandled-rejections=strict was not an option (https://github.com/nodejs/node/pull/26599) which we need in our tests
         - "^12.0.0"
         - "^14.1.0"  # pre 14.1, zip extraction was broken (https://github.com/microsoft/playwright/issues/1988)
+    timeout-minutes: 20
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-node@v2